To determine which animal is the most efficient feed converter, we need to calculate the feed conversion ratio (FCR) for each animal. The FCR is a measure of how much feed is required to produce a unit of weight gain. It is calculated using the formula: [ \text{FCR} = \frac{\text{Feed Consumed (kg)}}{\text{Weight Gained (kg)}} ] Let's calculate the FCR for each animal:

1. Animal P:
2. Feed Consumed: 50 kg
3. Weight Gained: 20 kg
4. FCR for P: [ \text{FCR}_P = \frac{50 \text{ kg}}{20 \text{ kg}} = 2.5 ]
5. Animal Q:
6. Feed Consumed: 90 kg
7. Weight Gained: 30 kg
8. FCR for Q: [ \text{FCR}_Q = \frac{90 \text{ kg}}{30 \text{ kg}} = 3.0 ]
9. Animal R:
10. Feed Consumed: 100 kg
11. Weight Gained: 25 kg
12. FCR for R: [ \text{FCR}_R = \frac{100 \text{ kg}}{25 \text{ kg}} = 4.0 ]
13. Animal S:
14. Feed Consumed: 150 kg
15. Weight Gained: 30 kg
16. FCR for S: [ \text{FCR}_S = \frac{150 \text{ kg}}{30 \text{ kg}} = 5.0 ]

Now, let's summarize the FCRs we calculated:

• FCR for P: 2.5
• FCR for Q: 3.0
• FCR for R: 4.0
• FCR for S: 5.0

Conclusion: The lower the FCR, the more efficient the animal is at converting feed into weight gain. Therefore, the most efficient feed converter among the animals is Animal P, with an FCR of 2.5. Explanation of Other Options:

• Option B (Q): FCR of 3.0 is higher than P's FCR of 2.5, making it less efficient.
• Option C (R): FCR of 4.0 is significantly higher than P's, indicating even less efficiency.
• Option D (S): FCR of 5.0 is the highest, meaning it is the least efficient feed converter among the four animals.

Revision Summary:

• The feed conversion ratio (FCR) is calculated by dividing the amount of feed consumed by the weight gained.
• The animal with the lowest FCR is the most efficient at converting feed into weight gain.
• Animal P has the lowest FCR (2.5), making it the most efficient feed converter.
• Always compare FCR values to determine efficiency; lower values indicate better feed conversion.